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'Photosystem II' in keywords Facet   Publication Year 1992  [X]
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1992[X]
1Author    Jack FarineauRequires cookie*
 Title    In Pea Thylakoids, a Special Thermoluminescence Band Was Observed at Low Temperature after Photoinhibitory Treatments Performed under Aerobic Conditions, either in vivo (in Leaf) or in vitro  
 Abstract    Characteristics o f thermoluminescence (TL) glow curves were studied in thylakoids isolated from pea leaves after an exposure to very high light in the TL device. The inhibition o f p h oto­ synthesis was detected both as decreases o f oxygen evolution rates and o f variable fluores­ cence. In another more classical experiment, leaves were exposed to high light at low tempera­ ture (5 °C) for 4 h and recovery o f normal PS II characteristics were followed during a 20 h time period under low light at 20 °C. TL study was performed on thylakoids isolated from these leaves. Charging o f bands was performed by an illumination at low temperature (-8 0 °C). Illumination at low temperature (-8 0 °C) induces 2 types o f TL bands called Z variable (Zv) band peaking at about —70 °C and a classical B band peaking at 35 °C. B band is ascribed to recombination in pairs S2/3QB", whereas the origin o f Zv bands remains unclear. M odified Zv bands, with flat shape and presenting a large part resistant to ethanol, were evidenced after som e minutes o f dark adaptation, both in light-exposed thylakoids and in thylakoids isolated from photoinhibited leaves. This ethanol resistant part in Zv band was only induced by p h oto­ inhibitory treatment performed under aerobic conditions (2 1 % 0 2 in media), both in vitro and in vivo; thus, the appearance o f the special Zv band would be related to an oxidative process accompanying photoinhibition. B bands presented reduced sizes and a shift o f peak maximum o f about 5 °C after some minutes o f dark adaptation. In vivo, the recovery o f a high PS II activ­ ity and o f B bands displaying normal characteristics occurs parallely to reappearance o f Zv bands with normal shape and with a vestigial ethanol resistant band. 
  Reference    Z. Naturforsch. 47c, 875—8 (1992); received July 27/A ugust 27 1992 
  Published    1992 
  Keywords    Pea, Photoinhibition, Photosystem II, Thermoluminescence, Thylakoid, Zv Band 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0875.pdf 
 Identifier    ZNC-1992-47c-0875 
 Volume    47 
2Author    R. Jockers, R. D. SchmidRequires cookie*
 Title    Synthesis of Long-Chain Triazine Aldehydes -Substrates of Bacterial Luciferase and Photosynthetic Inhibitors  
 Abstract    S-triazines are photosynthetic inhibitors. They have been substituted with co-aminoundeca-noic acid. The coupling products have been transformed into triazine aldehydes. These com ­ pounds displace radioactive terbutryn and have inhibitory effects on photosynthesis in plants and bacteria. Triazine aldehydes were shown to be effective substrates for bacterial luciferase. A competitive assay between photosystem-II-herbicides and aldehyde-labeled triazines is dis­ cussed. 
  Reference    Z. Naturforsch. 47c, 573—5 (1992); received April 7/June 15 1992 
  Published    1992 
  Keywords    Herbicides, Bacterial Luciferase, Triazines, Aldehyde, Photosystem II, Biosensor 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0573.pdf 
 Identifier    ZNC-1992-47c-0573 
 Volume    47 
3Author    ChunheX. Ua, Yong Zhub, GovindjeeacRequires cookie*
 Title    Differential Inhibition and Rephasing of Photosystem II Electron Acceptor Side by Monohalogenated Acetates of Different Hydrophobicity  
 Abstract    We demonstrate here that monohalogenated acetates (M F A , m onofluoroacetate; M CA, m onochloroacetate; M BA, monobrom oacetate) are unique probes o f the electron acceptor side o f the photosystem II (PS II) reaction center: (1) they differentially inhibit the reoxidation o f the reduced primary plastoquinone electron acceptor, QA~, by the secondary plastoquinone electron acceptor QB, and increase the equilibrium [QA_] in the order: M BA > M C A > M FA; and (2) M CA and M BA rephase the PS II electron acceptor side, a rather unusual effect. This results in flash number dependence o f [QA_] with maxima at even flashes to change to odd flashes. Furthermore, we demonstrate a correlation between the inhibitory activity o f the halo-genated acetates with their hydrophobicity (i.e., partition coefficient). 
  Reference    Z. Naturforsch. 47c, 711—7 (1992); received June 2 1992 
  Published    1992 
  Keywords    M onohalogenated Acetates, Photosystem II, Two Electron Gate, Hydrophobicity, Bicarbonate Effect 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0711.pdf 
 Identifier    ZNC-1992-47c-0711 
 Volume    47 
4Author    DirkH. Engels, Anke Engels, ElfriedeK. PistoriusRequires cookie*
 Title    Isolation and Partial Characterization of an l -Amino Acid Oxidase and of Photosystem II Complexes from the Cyanobacterium Synechococcus PCC 7942  
 Abstract    An L-amino acid oxidase with high specifity for basic L-amino acids was isolated from the cyanobacterium Synechococcus PCC 7942, and the enzyme was partially characterized. This enzyme was compared to the previously described L-amino acid oxidase from Synechococcus 
  Reference    Z. Naturforsch. 47c, 859 (1992); received October 4 1992 
  Published    1992 
  Keywords    Cyanobacteria, Synechococcus PCC 7942, Photosystem II, L-Amino Acid Oxidase, Water Oxi­ dizing Enzyme 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0859.pdf 
 Identifier    ZNC-1992-47c-0859 
 Volume    47 
5Author    Klaus-Peter Michel, ElfriedeK. Pistorius, E. Gau, G. Wälzlein, S. Gärtner, M. Kuhlmann, E. K. PistoriusRequires cookie*
 Title    Isolation of a Photosystem II Associated 36 kDa Polypeptide and an Iron-Stress 34 kDa Polypeptide from Thylakoid Membranes of the Cyanobacterium Synechococcus PCC 6301 Grown under Mild Iron Deficiency  
 Abstract    A 36 kDa polypeptide which previously was shown to be present in purified photosystem II complexes from Synechococcus PCC 6301 and which crossreacts with the antiserum raised against the soluble L-amino acid oxidase o f 50 kD a from Synechococcus PCC 6301 (A. was isolated from thylakoid membranes o f the same cyanobacterium grown under mild iron deficiency. This peptide is present in about equal am ounts in thylakoid membranes o f Syne­ chococcus PCC 6301 grown under regular or iron deficient conditions. The antiserum raised against this thylakoid membrane bound 36 kD a peptide crossreacts with the soluble L-amino acid oxidase o f 50 kDa. These results further support our conclusion that the thylakoid mem­ brane bound 36 kD a polypeptide is a modified form o f the soluble 50 kD a L-amino acid oxi­ dase. In addition, a 34 kD a polypeptide was isolated from iron stressed thylakoid membranes, and an antiserum was also raised against this protein. Im m unoblot experiments with this an­ tiserum show that the 34 kD a peptide is present in elevated amounts in thylakoid membranes from Synechococcus cells grown under iron deficiency and that it is alm ost absent in thylakoid membranes from cells grown under regular conditions. 
  Reference    Z. Naturforsch. 47c, 867—8 (1992); received August 4/O ctober 8 1992 
  Published    1992 
  Keywords    Cyanobacteria, Synechococcus PCC 6301, Photosystem II, L-Amino Acid Oxidase, Iron Stress 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0867.pdf 
 Identifier    ZNC-1992-47c-0867 
 Volume    47